Scott Peterson claims that multiple people saw his wife Laci after she reportedly went missing in a new interview from San Quentin State Prison, where he is currently sitting on death row.

It is the first time Scott has spoken publicly about the case since 2004, when he was convicted of first-degree murder for the death of Laci as well as second-degree murder for the death of Conner Peterson, his unborn son.

'I wasn't the last one to see Laci that day. There were so many witnesses that saw her walking in the neighborhood after I left,' Scott says in the interview, which was conducted over the phone from his California prison this past June by his sister-in-law Janey.

That claim is supported by over 11 witnesses, who say they spotted Laci out walking her dog after the mother-to-be, 27, reportedly went missing on Christmas Eve back in 2002.

This interview, never-before-heard eyewitness testimony and new bombshell claims about the relationship between Scott and his mistress Amber Frey will all be featured in the new A&E docuseries 'The Murder of Laci Peterson,' premiering Tuesday night at 9pm on the network.

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Scott speaks: Scott Peterson (above with Laci at their 1997 wedding) is breaking his silence for the first time since he was convicted of murdering his wife Laci and unborn son Conner in a new A&E docuseries

Horrible death: Laci was eight-months pregnant with her and Scott's first child at the time of her death (Laci above in 2002 just before she went missing)

Lethal injection: Scott is currently on death row after being sentenced on charges of first and second-degree murder (above in March 2005 after he was formally sentenced)

Prosecutors successfully argued that Laci was killed some time between the evening of December 23 and the following morning during Scott's murder trial.

The eyewitnesses tell a much different story however, including Mike Chiavetta who claims to have seen Laci's dog walking around the neighborhood on Christmas Eve - after Scott had left for the office.

'After I had talked to the police man and given my statement that I had seen the dog in the park nothing was followed up,' says Chiavetta.

'There was over 11 witnesses who saw Laci that day, this is all while Scott is at the office and on his computer, so he's innocent,' argues Janey, who has been Scott's staunchest defender from the start.

Key witness: The prosecution's case hinged largely on the revelation made by Scott's mistress Amber Fray (above in August 2004 with Gloria Allred), who said he never told her that he was married during their affair

Scott's jovial nature and decision to dye his hair blond while his wife was missing also led some to question how bereaved he actually was about his wife (left in May 2003, right in November 2004)

Cause for alarm: Scott even laughed during the closing arguments in the case, just before he was found guilty (above in December 2004)

It was three days after the discovery of his late wife's body that Scott was arrested by police, who picked him up in a parking lot where he claimed to be meeting his father and half-brother John - who is Janey's husband - for a round of golf.

At the time he was in possession of multiple cell phones, $15,000 in cash, 200 sleeping pills, his brother John's ID, a dagger and a gun.

Scott, who was 30 at the time, also had a map to the workplace of his mistress and approximately 10 Viagra tablets.

In his interview, Scott talks about Amber for the first time and explains why he continued to speak with her after his wife was reported missing.

'The overriding reason throughout it all was she starts giving media interview, there is no more search for Laci and Conner,' says Scott.

'I'd just seen what happened to the search for Chandra levy. There was no more search for her.'

He then adds: 'Every hour I could buy to keep the search going is all solved if I bring Laci and Conner home.'

Amber would eventually prove to be perhaps the most crucial witness in the case, providing the prosecution with their motive when she publicly announced that Scott had never told her that was married during their affair.

Alibi: Over 11 people (including Mike Chiavetta above) say that spotted Laci or her dog on Christmas Eve after her husband had left for his office, providing Scott with a possible alibi

Defender: 'There was over 11 witnesses who saw Laci that day, this is all while Scott is at the office and on his computer, so he's innocent,' argues sister-in-law Janey (above)

The trial began in the summer of 2004 and Scott was sentenced to death by lethal injection in March of the following year.

An appeal of that decision was filed by his legal counsel soon after and is still pending after over a decade.

Scott recalls the moment he heard the verdict being read to Janey, saying: 'It was just like this amazing, horrible, physical reaction that I had. I couldn’t feel my feet on the floor. I couldn’t feel the chair I was sitting in. My vision was even a little blurry.'

He goes on to state: ''And I just had this weird sensation that I was falling forward — and forward and down and there was going to be no end to this falling forward and down, like there was no floor to land on.

'I, I was staggered by it. I had no idea it was coming.'

The only forensic evidence that was found by police was a single strand of hair in a pair of pliers on his boat, which Scott had been on in the hours before he returned home to report his wife missing to police.

Tragedy: Scott was still convicted of murdering Laci and Conner and sentenced to death by lethal injection in 2005

Questions remain: An appeal of that decision was filed by his legal counsel soon after and is still pending after over a decade

Loose ends: The only forensic evidence that was found by police was a single strand of hair in a pair of pliers on his boat,

Witnesses claimed however that he spoke of his wife in the past tense and questioned his jovial and joking nature during the proceedings, where hecould often be seen smiling and joking with his team.

Scott's decision to dye his hair blond in the weeks before his wife's body was found also perplexed many, who questioned how bereaved he really was for the missing woman.

The defense argued however that Laci's death was likely connected to a burglary that occurred across the street from the house she shared with Scott.

'There's an appeals process that's ongoing, so his case is under appeal,' the documentary's executive producer John Marks told ABC News.

'So it felt like a moment, I think, for him, and for his lawyer to step up and ... say something about the case.'

He later added: 'I think when you listen to the witnesses who say they saw Laci in the park, I think that will be really ... that will be kind of a surprise.'